When a new theory is thought up, the theorists will usually supply some predictions, measurable by experimental physicists. String theory's predictions, however, are few and extremely difficult to test; since its inception over forty years ago, string theory has yet to be experimentally tested.

Randall is unimpressed with string theorists. String theory has not provided any useful new knowledge to engineering science as quantum physics has, and lacks the imagination-stirring philosophical implications that the general population associates with other fields — for example, quantum scientists have proven predictions like tunneling, used by modern electronic devices, and relativity is relevant to modern systems like GPS navigation. String theory hasn't reached that stage yet.

At the title text Randall points out that string theory is so technically difficult that at essentially every level (except, presumably, the very top), this explanation is as good as it gets.

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